Calibration support



FIG. 1 is a front elevational view of a calibration support showing our new design;

FIG. 2 is a back elevational view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a perspective view thereof. 

CLAIM I claim the ornamental design for a calibration support, as shown and described. 